Confident ... Australia opening batsman David Warner says he is under no pressure. Source: AAP

David Warner says he doesn't feel under any pressure at the pointy end of a struggling Australian top order despite a series of lean scores since his stunning hundred against India in Perth last summer.

Since blazing a hundred in a session against the hapless Indians in January on his way to a brilliant 180 that swept Australia to a series victory, Warner has struggled for form in the three-Test series against the West Indies and failed again with the bat in the first Test against South Africa.

In Brisbane, Australia slumped to 3-40 as their top order again looked brittle before Ed Cowan and Michael Clarke righted the ship.

The exciting opening batsman's dismissal to Dale Steyn for just four added to his scores of eight, 28, 42, 22, 29, 17, 50 and 11 since that 180 as his Test average slipped below 40.

"I've been sitting in the change room for a long time watching the other guys score a lot of runs and I'm ready to get back out there myself.''

Warner said he was looking forward to proving himself against South Africa's world-class pace attack of the No.1-ranked Test bowler in Steyn, No.2 Vernon Philander and No.9 Morne Morkel, and vowed to continue his aggressive approach.

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